Product Brochure

Why Tankless?
Continuous Hot Water
Enjoy the comfort and convenience
of continuous hot water, so you can
load the laundry, start the dishes and
still have enough hot water to enjoy a
relaxing hot bath.
Energy Savings
Estimated lifetime savings of $1,100
with Rheem Tankless Gas Water
Heaters
1
, and save up to 50% on
your water heating costs with Tankless
Electric Water Heaters throughout
your home.
ENERGY STAR
®
rated tankless gas
models are eligible for a limited time
federal tax credit. See energystar.gov
for more details.
Installation, Money
and Time Savings
Rheem tankless gas models are
compatible with the standard ½"
gas line
3
making it easier to replace
a traditional tank. Plus, high efficiency
models use PVC venting, which saves
on install time and materials cost.
Printed U.S.A.
09/22 WP Form No. THD-TK-100 Rev. 7
THINK TANKLESS FOR
CONTINU
U
S
HOT WATER
Why Recirculation?
Selection Considerations
Geography | Groundwater Temperature
Tank water heaters have the advantage of adding
incoming cold water to a tank already storing hot
water. Whereas, tankless models start heating water
when you need it. The colder the groundwater, the
more powerful the model needs to be. Consider
incoming water temperature (especially in winter)
when choosing a model.
Usage and Sizing
Continuous hot water means you can enjoy more hot
water with longer showers, use simultaneous fixtures
or both. Whether simultaneous showers or washing
laundry during bath time, consider your usage needs
to determine model size. For example, for a 2.5 bath
home, many plumbers will base usage off 2 showers
being used simultaneously. Consider usage when
choosing a model.
Venting
Gas tankless indoor models require new venting if
replacing a tank. Performance Plus models require
stainless steel venting, while Platinum models use
low cost PVC for venting, whereas outdoor models
require no venting at all. For this reason, outdoor
models are popular in warmer climates. Consider
tankless location, venting and venting material costs
when choosing a model.
By circulating hot water from
the tankless unit, through the
home’s plumbing it can be
ready at the faucet when
needed.
Benefits include:
•
Hot water without
the wait or the waste
• On-demand or timer
based pump means
hot water at the tap
when you need it
• The average household
can save up to 12,000
gallons of water per year
7
Features
• Digital display shows precise temperature
setting and maintenance codes
• Meets California SCAQMD requirements
for ULN emissions
• High efficiency models are Title 24-ready
• Freeze protection to -30°F
• High altitude compatible—up to 8,400 ft.
above sea level
$
D26P76761-17E
Performance
®
models offer:
Delivers Continuous Hot Water
For whole-home and point-of-use applications
Saves Money
Uses energy only when hot water is needed
Saves Space
Compact design frees up valuable storage space
How to Choose a
Tankless Electric Water Heater
Model # RETEX-06,
RETEX-04
Model # RETEX-13,
RETEX-11, RETEX-08
Model # RETEX-18
ELECTRIC
Point-of-Use
These units can be installed near the point of use—under sinks
and in garages, sheds, additions, utility rooms—even in an RV.
Whole-Home
These models work great for additions or workshops,
but can be used for a whole home in some climates.
Model # RETEX-27, RETEX-24
Model # RETEX-36
Don't see what you need in store? Visit Rheem.com/RETEX
Ground Water Temperature Varies
Select the color in the map for your location.
Refer to the usage chart to select
the right tankless water heater for
your needs.
Find The Unit That Meets Your
Needs
Based on the color of your location, find a
product that delivers the gallons per minute
(Max. GPM) that will meet your hot water needs.
With a higher GPM, you can have more hot
water outlets running at the same time.
1
2
3
Tankless
Verify electrical requirements.
Visit Rheem.com to ensure your home can
accommodate the power required.
Model # Volts AMPS
Minimum
Recommended
Breaker
RETEX-36 | 36kW 240 150 (4) 40
RETEX-27 | 27kW 240 112 (3) 40
RETEX-24 | 24kW 240 100 (3) 40
RETEX-18 | 18kW 240 75 (2) 40
RETEX-13 | 13kW 240 54 60
RETEX-11 | 11kW 240 46 60
RETEX-08 | 8kW 240 33 40
RETEX-06 | 5.5kW 220 29 30
RETEX-04 | 3.5kW 120 29 30
w
Electrical Specifications
Inlet Temp. 77º Inlet Temp. 72º Inlet Temp. 67º Inlet Temp. 62º Inlet Temp. 57º Inlet Temp. 52º Inlet Temp. 47º Inlet Temp. 42º Inlet Temp. 37º
Model #
Approx. Usage Approx. Usage Approx. Usage Approx. Usage Approx. Usage Approx. Usage Approx. Usage Approx. Usage Approx. Usage
RETEX-36 | 36kW
RETEX-27 | 27kW
RETEX-24 | 24kW
RETEX-18 | 18kW
RETEX-13 | 13kW
RETEX-11 | 11kW
RETEX-08 | 8kW
RETEX-06 | 5.5kW
RETEX-04 | 3.5kW
Not
Recommended
Not
Recommended
Not
Recommended
Not
Recommended
Not
Recommended
TANKLESS ELECTRIC WHOLE HOME & POINT-OF-USE SOLUTIONS
Visit
energystar.gov
for details
Limited
Time
Federal Tax
Credits*
THD-TK-100 Rev7-9 Zone Map.indd 2 9/26/22 12:41 PM